Custom Extended Swim Platform

Discussion in 'Boatbuilding' started by tpenfield, Jan 8, 2019.

  1. Blueknarr
    Joined: Aug 2017
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    Blueknarr Senior Member


    AGREED
     
  2. tpenfield
    Joined: Dec 2016
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    Location: Cape Cod, MA

    tpenfield Senior Member

    All cleaned up . . . I trimmed the hatches and put the ladders in place for fitting.

    IMG_2616B.jpg

    I did lots and lots of measuring for the fitting of the platform. Probably will do a test fitting later this week and then mount the platform if all is well.

    Yes, on the 4200 UV for the adhesive.

    I weighed the platform to see how close I came to my target weight.

    110 lbs. which is lighter than I thought it would be.
     
    Last edited: Jun 3, 2019
  3. fallguy
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    fallguy Senior Member

    How is that non slip again?

    Looks nice.
     
  4. tpenfield
    Joined: Dec 2016
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    tpenfield Senior Member

    Thank you. Not sure I understand your question :confused: :)
     
  5. tpenfield
    Joined: Dec 2016
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    Location: Cape Cod, MA

    tpenfield Senior Member

    Test Fitting of the Platform . . .

    I did a test fitting of the platform today. . .

    IMG_2619.JPG

    IMG_2620.JPG

    The sides need a little bit of trimming in order to tighten up the gap along the sides. I'll probably install for real tomorrow.
     
  6. tpenfield
    Joined: Dec 2016
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    Location: Cape Cod, MA

    tpenfield Senior Member

    The platform is now on the boat. . .

    I used 3M 4200 UV adhesive for the slab and to fill in the sides.

    IMG_2627.JPG

    Here is a close up of the seam . . .

    IMG_2625.JPG

    I have about 200 lbs. of water and other stuff holding the platform down while the adhesive sets.

    Next steps are to do the hardware and fastening underneath.
     
  7. tpenfield
    Joined: Dec 2016
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    Location: Cape Cod, MA

    tpenfield Senior Member

    Mechanical Fastening Update. . .

    I started in on the mechanical fastening of the platform today. There are 26 bolts that will hold the platform to the boat. I got 18 of them done, so 8 more to go.

    Here are a few pictures . . .

    Getting the 8 studs that will fasten the struts to the underside all cleaned up and ready to go. . .

    IMG_2628.JPG

    Here are the 4 struts fastened to the extended platform.

    IMG_2631.JPG

    Since the studs were not a 100% thread, I had to add the white spacers that you see, and will have to do likewise on the other end of the struts that attach to the underside of the boat's existing swim deck. There is a bit of variation in the thickness of the additional spacers that I will need; a couple of them need to be 7/8" thick, one 13/16" and the remaining one 11/16". I'll probably get some 1" thick material and plane them accordingly.

    Probably won't do much work for another week or so. Launch day is set for June 24th though . . . :)
     
    Last edited: Jun 11, 2019
  8. missinginaction
    Joined: Aug 2007
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    missinginaction Senior Member

    You really put a lot of thought and effort into this project. Looks really nice. Having to make minor adjustments with those spacers is not unusual with projects like these. I had to do something similar when I did a swim platform a few years ago. My project worked out great but wasn't nearly as intricate as yours turned out to be. Enjoy it! MIA
     
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  9. tpenfield
    Joined: Dec 2016
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    tpenfield Senior Member

    Thank you for your kind words. It was certainly a learning process, and one of those things "if I knew then what I know now", it could have been quicker, easier and with better results. The gelcoat did not come out as well as I would like, but that is fixable.

    I guess the real test will be to see if it supports the load that it is likely to see.
     
  10. tpenfield
    Joined: Dec 2016
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    Location: Cape Cod, MA

    tpenfield Senior Member

    Quick Update . . .

    I've got most of the remaining hardware and necessities on order. Things remaining on the platform before boat launching are:

    Fasten the 4 struts to underside of existing swim deck
    Install rubrail w/ stainless steel insert
    Install ladders
    Install hatches
    Install pop-out cleats
    Install cupholders

    I also plan to re-coat some areas of the gelcoat that needed a bit of fixing. Thinking I can do some roll & tip application of the gelcoat. We shall see how that goes. Gelcoat has been killing me throughout this project. :confused::eek::oops::rolleyes:
     
    Last edited: Jun 13, 2019
  11. ondarvr
    Joined: Dec 2005
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    ondarvr Senior Member

    This was a difficult project to take on as a rookie, you did a very good job.

    Now just think how easy it will be to infuse a new 32’ boat for next year.

    Come on, get with it, no time to waste.
     
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  12. tpenfield
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    Location: Cape Cod, MA

    tpenfield Senior Member

    Thanks @ondarvr . . . I appreciate your help along the way. The MCP harder recommendation was a life-saver. :)
     
  13. tpenfield
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    tpenfield Senior Member

    Interesting thought, building a boat.:)

    I occasionally have thoughts about building a 16 (ish) foot bowrider for ‘fun’. I was thinking of fiberglass over foam - unsinkable design. That could be a nice infusion project.

    Perhaps a thread for another time.:cool:
     
  14. tpenfield
    Joined: Dec 2016
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    Location: Cape Cod, MA

    tpenfield Senior Member

    Once I get the spaced blocks sized for the various thickness mentioned above, the real trick will be to see if I can get the bolts in the limited space between the upper and lower layers of the built-in swim platform.

    I am using the same type of squared u-bolts that I used on the extended swim platform. Just got to figure out if/how I can get them inside the ‘gap’ of the built-in platform.

    The built-in swim deck/platform is about 5.5” (height) with a 1” thick top surface and 1/4” thick bottom surface, leaving about a 4” air gap between them.

    The biggest issue is that it is a long reach with poor access. Might have to fabricate some sort of tool to extend beyond where my arms can reach.

    Any creative ideas ???

    My ‘plan B’ will be to drill a couple of deck plate holes through the bottom side for access, but I’d like to avoid that route if possible.
     

  15. Blueknarr
    Joined: Aug 2017
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    Blueknarr Senior Member

    My idea:

    Send an "electrician's fish" backwards thru the bolt holes. Tape the bolts to the fish wire and pull them into place.
     
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